# Claude Fable 5.1 vs O4 Mini

As of Oct 15, 2026, Claude Fable 5.1 leads O4 Mini in 5 of 5 shared categories: General LLM, Reasoning, Math, Factuality, and Abstraction (ARC).

Claude Fable 5.1: $20 per 1M blended tokens.

O4 Mini: $1.9250000000000003 per 1M blended tokens.

Claude Fable 5.1: closed weights.

O4 Mini: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Fable 5.1 leads O4 Mini in General LLM at #6 against #125.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Fable 5.1 leads O4 Mini in Reasoning at #5 against #129.
- Which to pick, Math: As of Oct 15, 2026, Claude Fable 5.1 leads O4 Mini in Math at #2 against #23.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Fable 5.1 leads O4 Mini in Factuality at #1 against #122.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5.1 leads O4 Mini in Abstraction (ARC) at #3 against #39.

As of Oct 15, 2026, Claude Fable 5.1 is tied for state of the art in Factuality (since Oct 2, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 15, 2026, O4 Mini is a former state-of-the-art holder in Math (since Jul 20, 2025; sources Humanity's Last Exam; methodology v1.0).